54 



Scientific Proceedings (88). 



10. In respect to the general results, the phenomenon of in- 

 compatibility appears to present some analogy to that of so-called 

 antigen-antibody reactions in immunity, and to isoagglutination 

 and isoprecipitation phenomena. Here, however, the incom- 

 patibility exists between organs produced side by side in the same 

 flower and which are of close somatic relationship. 



139 (1317) 



A demonstration of cerebellar and cerebral lesions in dogs. 



By I. Strauss and I. Friesner (by invitation). 

 [From the Department of Physiology of Columbia University] 



Dr. Pike with his characteristic modesty has asked us to pre- 

 sent these dogs. They show lesions which resulted in part from 

 design and in part from accident. The experiments were under- 

 taken in an attempt to study the relations between the internal 

 ear and the central nervous system. 



From a clinical point of view otologists look upon the results 

 of labyrinthine stimulation or destruction as divided into two 

 heads : 



1. Nystagmus. 



2. Vertigo. 



The brain pathways which intermediate the nystagmus im- 

 pulses are well known. On the other hand, those which have to 

 do with vertigo are very little known. Recently the theory has 

 been advanced that the cerebellum intermediates the labyrinthine 

 impulses which ultimately pass to the cerebrum, and have to do 

 with our sense of position. 



It was in the attempt to test this theory experimentally that 

 these operations were undertaken. Some of the dogs show the 

 result of injuries to the cerebellar peduncles. In another in 

 attempting to reach the peduncles we accidentally injured the 

 vermis and had to stop. Another dog shows the result of a bi- 

 lateral cerebellar lesion as well as a vermis lesion. We have but 

 commenced our studies and are indebted for our results largely 

 to the kindly patience and help of Dr. Pike. 



